2-methyl-5-(methyl-trifluoroacetyl-amino)-benzooxazole-4-carboxylic acid methyl ester 、 (R)-4-{2-[(1R,3R)-4-(tert-Butyl-diphenyl-silanyloxy)-1,3-dimethyl-butyl]-5,5-dimethyl-[1,3]dioxan-2-yl}-2-methyl-butyraldehyde 在
lithium diisopropyl amide 作用下,
生成 2-((2R,3R)-5-{2-[(1R,3R)-4-(tert-Butyl-diphenyl-silanyloxy)-1,3-dimethyl-butyl]-5,5-dimethyl-[1,3]dioxan-2-yl}-2-hydroxy-3-methyl-pentyl)-5-[methyl-(2,2,2-trifluoro-acetyl)-amino]-benzooxazole-4-carboxylic acid methyl ester